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Deferred tax - Movements in net deferred tax asset (Details) - GBP (£)
£ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Jun. 30, 2019
Movements in net deferred tax asset          
Net deferred tax asset at beginning of period     £ (26,550) £ (34,198) £ (34,198)
Expensed to the statement of profit or loss (note 11) £ 10,428 £ 8,633 10,779 9,974 8,112
Credited to other comprehensive income (note 11) (1,476) (1,254) (325) (110) (634)
Expense relating to share-based payments         170
Net deferred tax asset at end of period £ (16,096) £ (24,334) £ (16,096) £ (24,334) £ (26,550)